Zao Onsen — Spectacular Snow Monsters and Famous Hot Springs

High in the Zao mountains on the Yamagata side, at an elevation of about 880 meters, the hot spring village of Zao Onsen is a long-established bathing destination. Its strongly acidic sulfurous water (pH about 1.1 to 1.8) is renowned for benefiting skin conditions, neuralgia, and rheumatism, and is popular as a beauty bath. Today Zao Onsen is best known for the juhyo, or snow monsters: fir trees encased in rime ice into fantastic white shapes along the ski resort upper ridges.

Highlights

The snow monsters are the signature sight of Zao Onsen. From roughly January through early March, the upper mountain fir trees accumulate layers of freezing cloud moisture and wind-driven snow, growing into massive upright forms nicknamed snow monsters. Riding the ropeway to the upper slopes reveals a dreamlike landscape of countless rime-covered trees. The village has many inns with free-flowing spring water, and the large open-air bath with its milky white water is a popular spot. In summer, the area offers scenic driving on the Zao Echo Line and views of the turquoise crater lake known as Okama.

Seasonal Highlights

• Spring (April to May): The village quiets as the ski season ends, ideal for relaxed bathing
• Summer (June to August): Okama crater lake, alpine plants, and trekking
• Autumn (September to November): Foliage and hot springs, among the finest colors in Tohoku
• Winter (December to March): Peak season for snow monsters, skiing, and snowboarding combined with onsen

Getting There

• Nearest station: About 40 to 45 minutes by bus from JR Yamagata Station to Zao Onsen
• By car: About 20 to 35 minutes from Yamagata-Zao IC on the Yamagata Expressway
• Ropeway: The Zao Ropeway reaches the Juhyo Kogen and Jizo summit stations by connecting two lines; fares vary by section and round trip, so check the official site
• Snow monster season: Roughly early January to early March
• Okama and the Echo Line: Open from around late April to early November; the crater is not accessible in winter when the road is closed
• Day bathing: Available at many inns and communal baths, with fees varying by facility

Practical Travel Notes

• Best Season: January and February for snow monsters, summer for Okama and alpine plants, and around October for foliage
• Best Time of Day: The winter nighttime snow monster illumination is atmospheric and popular; clear mornings offer the best daytime visibility
• Avoiding Crowds: Weekends in snow monster season are busiest, so ride the ropeway early in the morning
• Time Needed: Viewing the snow monsters by ropeway takes about half a day including transfers and walking; a full day allows bathing as well
• Nearby Real Spots: In summer, reach Okama via the Zao Echo Line and the Zao Highline on the Miyagi side, which charges an entry toll; the city of Yamagata is also nearby
• Budget: Allow for ropeway fares, day-bathing fees, and the summer Zao Highline toll

Tips

Because the water is strongly acidic, rinse well after bathing, and those with sensitive skin should keep sessions short. Warm clothing is essential for viewing the snow monsters, as it is very cold near the summit ropeway station. Summer visits to Okama are possible only while the Zao Echo Line is open, generally late April to early November, and the crater cannot be reached in winter. Ropeway fares, operating status, and access to Okama can change from year to year, so confirm official information in advance.

📚 Sources

This article is based on the guidance for the hot spring published by the Zao Onsen tourism association and Yamagata City, materials on the public baths and springs, and the local information boards. Opening hours and fees of the public baths and day-use facilities, and the operation of the ice trees and ropeway, vary by season, so please confirm the latest details through the Zao Onsen tourism association or each facility before visiting. Please also check in advance the bathing precautions for the strongly acidic water.

Visitor Checklist

• Estimated time: About half a day to a full day to enjoy the bath-hopping and public baths
• What to bring: A towel, plus warm clothing and non-slip shoes if visiting in winter
• Timing tips: Combine the town public baths and day-use facilities for a bath-hopping tour
• Highlights: The strongly acidic sulfur spring known as a beauty bath, the winter ice trees (snow monsters), and the highland scenery
• Note: Because the water is strongly acidic, manage your condition when bathing and avoid soaking too long

Practical Information for Your Visit

• Volcano information (as of July 26, 2026): Mount Zao is not listed among the volcanoes under an eruption warning on the Japan Meteorological Agency's "Information for Volcano Climbers" page
• Zao Ropeway fares (summer): To Jizo Sancho Station (altitude 1,661 m), 2,200 yen one way and 4,400 yen round trip for adults, 1,100 yen one way and 2,200 yen round trip for children. To Juhyo Kogen Station (altitude 1,331 m), 1,200 yen one way and 2,200 yen round trip for adults, 600 yen one way and 1,100 yen round trip for children (adult fares apply from junior high school age, child fares to elementary school pupils)
• Zao Ropeway operating hours: Sanroku Line 8:30-17:00, Sancho Line 8:45-16:45 (both subject to change). The last upward departure for a round trip to Jizo Sancho Station leaves Zao Sanroku Station at 16:00
• Utopia summer chairlift: 800 yen round trip and 400 yen one way for adults, 400 yen round trip and 200 yen one way for children (no group discount is available on the chairlift)
• Group use: Groups of 20 or more riding the ropeway must reserve in advance (Zao Sanroku Station TEL 023-694-9518)
• Zao Onsen Dai-rotenburo (large open-air bath): In Reiwa 8 (2026) it opens for the season on April 25. Weekdays 9:30-17:00 (last reception 16:30), weekends and public holidays 9:30-18:00 (last reception 17:30). The bathing fee is 850 yen for adults and 400 yen for children (aged 1 and over but under 12). There are 60 parking spaces for users only. Closed from late November to the following April. Because the water is free-flowing from the source, there are no showers and soap, shampoo and the like cannot be used (Zao Onsen Kanko Co., Ltd. TEL 023-694-9417)
• Hoshizora Dai-rotenburo (starry-sky open-air bath): In Reiwa 8 (2026) it is scheduled to operate on designated days from June to early October. 18:30-21:00 (last entry 20:30), 1,000 yen for adults and 500 yen for children (discount vouchers and the usual special bathing tickets for overnight guests cannot be used)
• Spring quality of the large open-air bath: The source temperature is 50.8 degrees C, the flow is about 735 liters per minute, and the pH is 1.9. Because it is strongly acidic, the operator officially advises bathers to remove metal accessories, not to scrub the skin hard, not to drink the water, and to wipe the body thoroughly after bathing
• Access to Okama (Miyagi Prefecture side, Zao Highline): In 2026 the road is open from April 24 to early November (planned), with winter closure from early November to late April. Operating hours are 7:30-17:00 (last entry 16:30). Tolls (revised April 1, 2025) are 600 yen for ordinary, light and small cars, 450 yen for motorcycles (over 125cc), 1,500 yen for microbuses and 2,400 yen for large freight vehicles. Payment is cash only, and vehicles of 125cc or less, bicycles and pedestrians are not allowed
• Winter closure of the Zao Echo Line: In 2026 the winter closure starts at 17:00 on November 4, and the road is due to reopen at 11:00 on April 23, 2027 (Zao Town official information). Just after it reopens (late April to early May) and from mid-October until the winter closure begins, the road is also closed at night from 17:00 until 8:00 the next morning
• Local bus to Okama: The bus between Shiroishi-Zao Station and Zao Katta Sancho is scheduled to run on weekends and public holidays from April 25 to early November 2026, with a fare of 2,100 yen (Miyako Bus Shiroishi Office TEL 0224-25-3204)

Note: The opening hours and bathing fees of Zao Onsen's communal bathhouses (Kami-yu, Shimo-yu and Kawara-yu) are not published on the official website. Note: The times and fares for the Zao Ropeway's night operations in winter (the frost-covered tree season) are not covered in this article because the official website and the Zao Onsen Tourism Association give different information. (Sources: Zao Ropeway official website; Zao Onsen Kanko Co., Ltd. "Zao Onsen Dai-rotenburo"; Miyagi Kotsu "Zao Highline"; Zao Town Tourism and Products Association; Japan Meteorological Agency)